The following drawdown data were obtained from a pumping test performed on a confined sandy aquifer. Determine the transmissivity and storage coefficient using Jacob's equation ; if the pumping rate was constant at $200$ liter $\frac{?}{sec}$ and the drawdown data were obtained from an observation well located $800m$ from the abstraction well.

$\backslash$table$[[\backslash$table$[[$Time$],[($min$)]],0,20,30,40,50,60,90,125,200,300,500],[\backslash$table$[[$Water$],[$Level